Your instructions say to decompress the DHT11 software library into the libraries folder of the Arduino IDE. I’m running under MAC OSX and I don’t see any accessible libraries folder in the IDE. If I add the software to my Sketchbook folder and try to verify the dht11_functions file, I get a compiler error thrown. Can you help?
On the Mac OSX platform you will need to create a libraries folder in your sketches directory. Then put the entire “DHT11? folder into the libraries folder, restart your IDE and you should have DHT11 as an option from the examples menu.
Let me know if it still gives you trouble, and I will be happy to help.